Hey guys,

Long time lurker, first time poster just seeking assistance with my recently swapped EK1.

Recently I had my car swapped from the stock d16y4 to the b18c for a little more power/fun (inb4 why not K), loving it so far (knock on wood no major issues) but when it was first given to me from the mechanic, it came with an engine light.

The mechanic originally told me that the o2 sensors were out of whack and they needed to be replaced - which, was fair enough given that I had paid this guy to swap my engine not my o2 sensors - as long as the engine was in good knack and healthy (again touch wood so far so good) I was not too picky about it and was willing to bear the cost of new o2 sensors - also keeping in mind the person I bought the car off had the engine light come on with the d16y4 prior to my swap as well, his explanation was that the "cluster was ****ed" and everything was ok though.

My question now is that I've had the car for about 3 weeks and have been running around getting parts and quotes for new stuff to be installed (the joys of your first modified car, from bone stock) and the engine light still comes on every now and then, now the exhaust was never changed so I have a sneaking suspicion it could have something to do with it, also I only got 330km on a full tank of 95.

Now I guess the point of this post is that I got a quote for a new exhaust system including cat, piping muffler etc which I'm going to have to wait 2 weeks for parts to come in, so I'm gonna have to sit tight with what I have.

Should I change my o2 sensors now, or should I wait for the new exhaust before I change my sensors? Also, if I were to install the new sensors on the existing exhaust, is it possible to take them off and install them on the new exhaust once it's installed? I don't wanna risk damaging anything but at the same time I don't want to double handle and end up paying twice as much.

Advice greatly appreciated, from someone who has recently got into the car and modification scene definitely seeing this stuff makes you nervous and information you find on the internet is usually scare mongering in attempts to get you to spend money, so I want some feedback from people who have actually had the sort of issue before.

Thanks!